org.apache.hadoop.hbase.replication
Class ReplicationPeer

java.lang.Object
  org.apache.hadoop.hbase.replication.ReplicationPeer

All Implemented Interfaces:

Closeable, Abortable

@InterfaceAudience.Private
public class ReplicationPeer
extends Object
implements Abortable, Closeable

This class acts as a wrapper for all the objects used to identify and communicate with remote peers and is responsible for answering to expired sessions and re-establishing the ZK connections.

Nested Class Summary

class

ReplicationPeer.PeerStateTracker Tracker for state of this peer

Constructor Summary

ReplicationPeer(org.apache.hadoop.conf.Configuration conf, String key, String id)
Constructor that takes all the objects required to communicate with the specified peer, except for the region server addresses.

Method Summary

void	abort(String why, Throwable e) Abort the server or client.
void	close()
String	getClusterKey() Get the cluster key of that peer
org.apache.hadoop.conf.Configuration	getConfiguration() Get the configuration object required to communicate with this peer
String	getId() Get the identifier of this peer
long	getLastRegionserverUpdate() Get the timestamp at which the last change occurred to the list of region servers to replicate to.
AtomicBoolean	getPeerEnabled() Get the state of this peer
List<ServerName>	getRegionServers() Get a list of all the addresses of all the region servers for this peer cluster
ZooKeeperWatcher	getZkw() Get the ZK connection to this peer
boolean	isAborted() Check if the server or client was aborted.
static boolean	isStateEnabled(byte[] bytes) Parse the raw data from ZK to get a peer's state
void	reloadZkWatcher() Closes the current ZKW (if not null) and creates a new one
void	setRegionServers(List<ServerName> regionServers) Set the list of region servers for that peer
void	startStateTracker(ZooKeeperWatcher zookeeper, String peerStateNode) start a state tracker to check whether this peer is enabled or not

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

ReplicationPeer

public ReplicationPeer(org.apache.hadoop.conf.Configuration conf,
                       String key,
                       String id)
                throws ReplicationException

Constructor that takes all the objects required to communicate with the specified peer, except for the region server addresses.

Parameters:

conf - configuration object to this peer

key - cluster key used to locate the peer

id - string representation of this peer's identifier

Throws:

ReplicationException

Method Detail

startStateTracker

public void startStateTracker(ZooKeeperWatcher zookeeper,
                              String peerStateNode)
                       throws org.apache.zookeeper.KeeperException

start a state tracker to check whether this peer is enabled or not

Parameters:

zookeeper - zk watcher for the local cluster

peerStateNode - path to zk node which stores peer state

Throws:

org.apache.zookeeper.KeeperException

getClusterKey

public String getClusterKey()

Get the cluster key of that peer

Returns:

string consisting of zk ensemble addresses, client port and root znode

getPeerEnabled

public AtomicBoolean getPeerEnabled()

Get the state of this peer

Returns:

atomic boolean that holds the status

getRegionServers

public List<ServerName> getRegionServers()

Get a list of all the addresses of all the region servers for this peer cluster

Returns:

list of addresses

setRegionServers

public void setRegionServers(List<ServerName> regionServers)

Set the list of region servers for that peer

Parameters:

regionServers - list of addresses for the region servers

getZkw

public ZooKeeperWatcher getZkw()

Get the ZK connection to this peer

Returns:

zk connection

getLastRegionserverUpdate

public long getLastRegionserverUpdate()

Get the timestamp at which the last change occurred to the list of region servers to replicate to.

Returns:

The System.currentTimeMillis at the last time the list of peer region servers changed.

getId

public String getId()

Get the identifier of this peer

Returns:

string representation of the id (short)

getConfiguration

public org.apache.hadoop.conf.Configuration getConfiguration()

Get the configuration object required to communicate with this peer

Returns:

configuration object

abort

public void abort(String why,
                  Throwable e)

Description copied from interface: Abortable

Abort the server or client.

Specified by:

abort in interface Abortable

Parameters:

why - Why we're aborting.

e - Throwable that caused abort. Can be null.

reloadZkWatcher

public void reloadZkWatcher()
                     throws IOException

Closes the current ZKW (if not null) and creates a new one

Throws:

IOException - If anything goes wrong connecting

isAborted

public boolean isAborted()

Description copied from interface: Abortable

Check if the server or client was aborted.

Specified by:

isAborted in interface Abortable

Returns:

true if the server or client was aborted, false otherwise

close

public void close()
           throws IOException

Specified by:

close in interface Closeable

Throws:

IOException

isStateEnabled

public static boolean isStateEnabled(byte[] bytes)
                              throws DeserializationException

Parse the raw data from ZK to get a peer's state

Parameters:

bytes - raw ZK data

Returns:

True if the passed in bytes are those of a pb serialized ENABLED state.

Throws:

DeserializationException